priest



' No. 623,825. Patented'Apr. 25, I899.

s. PRIEST & s. PRIEST, 18.

BACK PEDALING BRAKE;

. (Application filed Sept. 28, 1898) (No Model.)

Wilizesses:

ditorzzgys.

UNITED STATES PATENT Q FICE.

STEPHEN PRIEST AND STEPHEN PRIEST, JR., OF WEST DEVONIORT.

' TASMANIA.

BACK-PEDALING BRAKE.

SPECIFICATION forming part of Letters Patent No. 623,825, dated April25, 1899. Applicationfiled September 28, 1398. Serial No- 692,092. (Nmodel-l To (ti-L 707mm 7'1" magic/tr er..-

Be it known that we, STEPHEN PRIEST and STEPHEN PRIEST, l he You nger,subjects of the Queen of the United Ki ngdom of Great Britain andIreland, residing in West Devouport, in thcfifolony of Tasmania, haveinvented certain new and useful Improvements inCyelc Hub Brakes; and wedo hereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art towhich it appertains to make and use the same.

The brake mechanism which forms the subject of this invention is ofsmall Weight and 15. comprises an inclosed clutch-gear at the hub of thed living-wheel, the said clutch being out of sight and protected frommechanical injuryhud other parts, as shown on the attached drawings. Thebrake is applied by the action of the feet instead of by the hands, aswith most brakes, andth e feet are always allowed to remain in positionon the pedals. The pedals will be motionless when the brake is on and soact as foot-rests, the rider being able to immediately reeomrnenceforward pedaling at will. This feature is notably beneficial to therider when descending any hill or grade where themachine will run 'byitself, as by having the pedals motionless the labor of ordinaryback-pedaling is obviated.

In the drawings herewith, Figure 1 is a plan, partly in horizontalsection, of the hub of the driving-wheel of a safety-bicycle or thelike, there being around the central axle a driving-axle and outside thelatter the barrels of a hollow clutch, the said barrels being adapted toslide laterally. In this figure the brake is olifn Fig. 2 is also aplan, partly in horizontal SQOtlOll,lS in Fig. 1, but with the brake on.Fig. 3 is a side elevation with the brake oft, showing the partsoutsidethe hub, which parts may in practice be preserved from dust andinterference bya cover. (Not shown.) Figs. l to I are perspective viewsof respective details.

A is a friction or brake hand, one end of which is connected by asuitable supportingstud 13 to the baclzstay or other convenient part ofthe frame of the cycle and the other end oi which is connected to a lug(J on a movable quadrant 1), which is pivoted upon the stud B. The teethE of the quadrant engage teeth F, located upon the cylindrical member Gof the clutch, which is acted on by the barrel II when the brake isapplied. A barrel H is provided, which telescopes into barrel H and hasits range of movement limited 'by a pin H on 1-1, working in a slot 11in 'II. The relative positions of II and II are kept in normaladjustment by a strong spring II", the use of said spring being furtherexplained hereinafter.

J is a stationary central axle passing loosely through the cylinder Gand also loosely through the.driving-a xle K, which may be integralwith, but is usually keyed to, the driving-sprocket L. The axle K issquare or of other equivalent section and extends through H and H, whicheach fit it accurately, so that both barrels turn together as thedriving-axle K turns.

M is the hollow hub, having fixed thereto within one end a ring ofratchet-teeth N, with which a corresponding ring of teeth 0 atone end ofH engages when the brake is oft.

Q is a ring of ratchet-teeth on G, with which a corresponding ring ofteeth P on the near end of H engages when the brake is on. The normalcombined length of barrels II II is shorter than the distance betweenthe teeth N and Q, and these barrels slide laterally whenever the brakeis put on or off. In order that the part G may be unable to slide alongthe axle J, the latter has a collar R upon it, against which one sideofG abuts, there being on the other side of G a retaining-nut G.

S is a cap or nut to adjust the driving-axle.

K and its hearings in place, and T is a checknut. \Vhen going forwardwith the brake off, the sprocket L, with axle K, revolves (upon suitablehearings) in the direction of arrow 7, Fig. 4, and barrels H and IIrevolve in the direction of arrow 8, Fig. 5, the teeth 0 and N beinginterlocked. To put on the brake, the rider stops pedaling. This stopsthe chain (or its equivalent) and also the sprocket L and the axle K;but as the driving-wheel U coutinues to rotate the teeth N do not stopmoving, and, being unable to carry'teeth O with thcm,'they push thelatter towardG until teeth 0 are free from teeth N and teeth P areinterlocked with teeth Q, any clashing of P and Q being softened by theresilience of barrel ,H, allowed by the spring H;

ment backward) is to make the chain turn sprocket L, with axle K andalso barrels H gagements', subject to displacement by a rcand H, in thedirection of-a'rrow 9,-Figs. 4 and 5,whereup'on the teeth F begin to turn,thereby swi-ngingquadraut D and closing up the band A upon abrake-flange W, which is bolted to the hub. Then so long as the-riderholds the pedals at rest the brake must remain on; but when'he starts topedal forward the barrels H II will begin to move as per arrow 8 andturn G, so as to take oif the brake. The teeth P, however, owing totheirbevel will also proceed to glide out of engagement with teeth Q,bringing teeth 0 into-engagement with teeth N. A pair ofinwardly-pressing beveled spring-teeth X, secured at a; x to a shell X,which incloses a port-ion of the.hub M and is fastened at x id to one ofthe flanges thereofand fits closely upon the hub at x 00 are used tokeep the barrels H H positively at one side or the other of their rangeof movement, so that the teeth'O or P when not in engagement shall notby friction be Worn down.

lhe beveled teeth X press upon lugs Y (with beveled sides) upon barrelH, and by reason of the pressure of the inclined surfaces thelongitudinal movementfof barrel H toward whichever side the ratchetteethare to be engaged is accelerated and slightly added to.

What we claim is- I 1,. In a cycle hub-brake, the combination with anon-rotatingaxle, ahol'low driving-axle, angular in cross-sectionmounted thereon, a barrel ,composed of two telescopic members providedwith right and left ratchet-teeth upon their outer ends fittingsaid'driving-axle to rotate therewith, but-having axial'movementthereon, acylinder mounted upon the fixed axle at one end of said barreland havin g ratchet-teeth arranged to engage the teeth upon the adjacentmember of said barrel when the driving-axle is turned-backward, a

hub loosely inclosing said barrel and having interior ratchet-teetharranged to engage the ratchet-teeth upon the other member of said.barrel when the driving-axle is turned forwvard, the said cylinderhaving a limited rotary movement upon the fixed axle atthe forwardextremity of which movement the teeth on the adjacent member of saidbarrel will pass over the teeth on said cy1inder,and means for retainingsaid barrel in either of its enverse movement of the driving-axle,substantially as described.

2. In a cycle hub-brake, the combination with a non-rotating axle,ahollow driving-axle angular in cross-section mounted thereon, a barrelcomposed of two telescopic members provided with right and leftratchet-teeth upon their outer ends fitting said driving-axle to rotatetherewith, but having axial movement thereo'n, a coil-spring interposedbe 'tweenthe two members of said barrel, means for allowing to themembers of said barrel a limited axial movement withrespect to eachother, a cylinder mounted upon the fixedaxle at one end of said barrel,and having ratchett-eeth arranged to. engage theteeth upon the adjacentmember of said barrel, when the driving-axle is turnedbackward,ahubloosely inclosing said barrel and having interiorratchet-teeth arranged to engage the ratchet: teeth upon theother-memberof said barrel when the driving-axle is turned forward, thesaid cylinder having a limited rotary movement upon the fixed axle atthe forward ex: tremity of which-movement the teeth on the adjacentmember of said barrel will pass over the teeth on said cylinder, andmeans for retaining said barrel in' either of its engage- 8 mentssubject to displacement by a reverse movement of thedriving-axle,substantially .as described.

- 3.- In a cycle hub-brake, the combinationwithanon-rotatingaxle,ahollowdriving-axle 9c angular in'cross-sectionmounted thereon, a barrel composed of' two telescopic members providedwith right and left ratchet-teeth upon theirouter ends fitting saiddriving-axle to'rotate therewith, but having axial move- 5 ment thereon,a cylinder mounted upon the fixed axleat one end of said barrel, andhaving ratchet-teeth arranged to engage the teeth upon the adjacentmember of said barrel, when the driving-axle is turned backward, a- -roohub loosely inclosing said barrel and having 'interior'ratchet-teetharranged to engage the ratchet-teeth upon the other member of saidbarrel when the driving-axle is turned forward, the said cylinder havinga limited rom5 tary movement upon the fixed axle'whereby the forwardmovement of the driving-axle will cause the disengagement of theratchetteeth on said cylinder from the ratchet-teeth on the adjacentmember of said barrel, means 1 to for retaining said barrel in either ofits engagements subject to displacement by a reverse movement of thedriving-axle, a toothed segment upon said cylinder, 3. rack-bar havingteeth adapted to engage said toothed seg 11 5 ment pivoted to a fixedportion of the frame, and a brake-band connected to said rack-bar,substantially as described.

4. In a 'cycle hub-brake, the combination 7 with a non-rotatin g axle, ahollow driving-axle 1 :0 angular in cross-section mounted thereon,abarrel composed of two telescopic members provided with right and leftratchet-teeth upon their outer endsfittingsaid driving-axle #to rotatetherewith, but having axial move- :25 I ment thereon, a cylinder-mountedupon the fixed axle at one end of said barreland having ratchet-teetharranged to engage the teeth upon the adjacent member of said barrelwhen the driving-axle is turned backward, a hub :30 loosely inclosingsaid barrel and having interior ratchet-teeth arranged'to engage theratchet-teeth upon the other member, of said barrel when thedriving-axle is' turned forward, the said cylinder having a limitedrotary movement upon the iixed axle at the forward extremityof whichmovement the teeth on the adjacent member of said barrel will pass overthe teeth on' the said cylinder; lugs 'on one member of said barrel, andspringprovided with right and left ratchet-teeth upon theirouter endsfitting said driving-axle to rotate therewith, but having axial movementthereon, a cylinder mounted upon the fixed anle at one end of saidbarrel, and having .ratchet teeth arranged to engage the teeth upon theadjacent member ofIsaid barrel, when the driving-axle is turnedbackward, a hub loosely inclosing said barrel and having interiorratchet-teeth arranged to engage the ratchet-teeth npon the other memberof said barrel when the driving-axle is turned forward, the saidcylinder having a limited rotary movement upon the fixed axle wherebythe forward movement of the driving-axle vill cause the disengagement ofthe ratchetteeth on said cylinder from the ratchet-teeth on the adjacentmember of said barrel, means for retaining said barrel in either of itsengagements subject to displacement by a reverse movement of thedrivingaxle, a toothed segment upon said cylinder,

a rack-bar having teeth adapted to engage said toothed segment pivotedto a fixed portion of the frame, a brake-flange on said hub, aband-brake encircling said flange and secured at one end to a fixedportion of the frame,a.nd at itsother end to said pivoted rackbar,substantially as described.

In witness whereof we have hereunto-set our hands in presence of twowitnesses.

S. PRIEST. STEPHEN PRIEST. J NR.

Witnesses:

CHARLES PEARL, W. II. OWEN.

